Reduce display brightness on iMac

Dear all
I have just received my new 27" core i7 imac.. The screen is a bit bright for me but I can't find a way of making it a bit darker - any ideas?
Thanks

You can adjust it by going to System Preferences -> Displays and turning down the brightness there. If that doesn't do the job well enough for you, you can also install a third party app called "Shades", which works well for me:
http://www.charcoaldesign.co.uk/shades

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